Which term describes a compound made of two identical monomers?

• A. Dimer
• B. Trimer
• C. Polymer
• D. Monomer

Answer: (A)

A compound made of two identical monomers is specifically referred to as a dimer. This term comes from the prefix "di-", meaning two, and "mer," which denotes a unit or part. Dimers can be formed through various chemical processes such as condensation reactions, where the two monomers join together, often releasing water as a byproduct.

To clarify the other terms: a trimer consists of three monomer units, a polymer is a larger compound made up of many monomers (which can be identical or different), and a monomer itself is a single molecule that can join together with other monomers to form larger compounds. Understanding these definitions helps in distinguishing between the various levels of molecular complexity in biology.